Date: Sat, 05 Aug 2023 18:19:45 +0000 From: 0x1eef <0x1eef@protonmail.com> To: Steven Friedrich <freebsdlouisville@gmail.com> Cc: freebsd@vanderzwan.org, FreeBSD Questions Mailing List <freebsd-questions@freebsd.org> Subject: Re: Using /etc/hosts, not dns Message-ID: <RbmQ19YYo7yFyVKAsrp0-Kwfx5UG1RsmX_UNr3cVtBXHbi5xzvf0y76XTZdUCariXCea6iTS9Vy7jo9awBebnwgnYYX5wUDCqxern8INSIE=@protonmail.com> In-Reply-To: <6c840288-0446-122d-7d97-d6b02982e27c@Gmail.com> References: <846f37ec-c0b3-0b1a-6294-1da6a9260777@Gmail.com> <1ED24C4A-FABF-4096-970D-4017616FC124@vanderzwan.org> <ebb7199a-98bc-980e-a077-f7a7c7085b4e@Gmail.com> <F269F458-919D-42D4-BDE4-E7A56C74BB02@vanderzwan.org> <6c840288-0446-122d-7d97-d6b02982e27c@Gmail.com>
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> Correct, Linux still works. After all these years and my extensive Unix
> experience, I am abandoning FreeBSD. You have completely abandoned
> common sense.
I thought this might be an interesting bit of information to add to the
thread.=20
On OpenBSD, /etc/resolv.conf supports a 'lookup' keyword that FreeBSD
has not implemented (AFAICT).=20
>From the man page:
lookup This keyword is used by the library routines gethostbyname=
(3)
and gethostbyaddr(3). It specifies which databases should=
be
searched, and the order to do so. The legal space-separat=
ed
values are:
bind Query a domain name server.
file Search for entries in /etc/hosts.
If the lookup keyword is not used in the system's resolv.c=
onf
file then the assumed order is bind file. Furthermore, if
the system's resolv.conf file does not exist, then the onl=
y
database used is file.
But the 'host' command is the same as FreeBSD, and does not consult /etc/ho=
sts.
It should still be possible to write a small C program that uses gethostbyn=
ame(3),
and that should respect the lookup order. As long as resolv.conf has=20
'lookup file bind' it would consult /etc/hosts first and then consult=20
name servers second.
I wrote a proof of concept (I'm trying to learn C, so this was a good task=
=20
for me):
#include <netdb.h>
#include <stdio.h>
#include <sys/socket.h>
#define IPv4_FORMAT "%hhu.%hhu.%hhu.%hhu"
int
main(void) {
struct hostent *ent;
ent =3D gethostbyname2("read.amazon.com", AF_INET);
if (h_errno =3D=3D NETDB_SUCCESS) {
char *addr =3D ent->h_addr_list[0];
fprintf(stdout, IPv4_FORMAT, addr[0], addr[1], addr[2], addr[3]);
fprintf(stdout, "\n");
} else {
fprintf(stderr, "error: %s", hstrerror(h_errno));
}
return 0;
}
0x1eef
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